Parse drop-shadow() filter syntax

• Component: CSS
• Status: RESOLVED FIXED

[Dean Jackson]

drop-shadow is more complicated than the other effects because it takes shadow syntax (with some restrictions). I'll need to extract the shadow parsing code from CSSParser into something that can be used for this as well.

[Radar WebKit Bug Importer]

<rdar://problem/10211535>

[Dean Jackson]

Created attachment 114425 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 114425 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=114425&action=review

r+ but please remove the FIXME

> Source/WebCore/css/CSSParser.cpp:6507
> +        maximumArgumentCount = 5; // FIXME: is this right?

Is it?

> Source/WebCore/css/CSSParser.cpp:6750
> +                RefPtr<CSSValueList> shadowValueList = parseShadow(args, CSSPropertyWebkitFilter);

I think it's a bit odd to re-use parseShadow for this filter.

[Dean Jackson]

(In reply to comment #3)
> (From update of attachment 114425 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=114425&action=review
> 
> r+ but please remove the FIXME
> 
> > Source/WebCore/css/CSSParser.cpp:6507
> > +        maximumArgumentCount = 5; // FIXME: is this right?
> 
> Is it?

Oops!! I need to test that.

> 
> > Source/WebCore/css/CSSParser.cpp:6750
> > +                RefPtr<CSSValueList> shadowValueList = parseShadow(args, CSSPropertyWebkitFilter);
> 
> I think it's a bit odd to re-use parseShadow for this filter.

That was the majority of the work in this patch. We share exactly the same syntax as text shadow and it has all the smarts to parse the (quite complex) shadow syntax. It would be a lot of duplicated code otherwise.

The fact that I can pass in CSSPropertyWebkitFilter is something I should consider changing. The parseShadow code doesn't expect that and happens to fall into a mode where it disallows spread and inset style - just as we want.

[Dean Jackson]

http://trac.webkit.org/changeset/99883